Volume 36 Issue 6
Dec.  2019
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GAO Fei, LI Yonggang, SUN Hao, LIU Yingmin, ZHANG Xingguo, GUO Xiaoyang. Curing Method and Study on the Mechanical Performance of Set Cement in Cementing Thermal Production Wells[J]. DRILLING FLUID & COMPLETION FLUID, 2019, 36(6): 731-736. doi: 10.3969/j.issn.1001-5620.2019.06.013
Citation: GAO Fei, LI Yonggang, SUN Hao, LIU Yingmin, ZHANG Xingguo, GUO Xiaoyang. Curing Method and Study on the Mechanical Performance of Set Cement in Cementing Thermal Production Wells[J]. DRILLING FLUID & COMPLETION FLUID, 2019, 36(6): 731-736. doi: 10.3969/j.issn.1001-5620.2019.06.013
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Curing Method and Study on the Mechanical Performance of Set Cement in Cementing Thermal Production Wells

doi: 10.3969/j.issn.1001-5620.2019.06.013

  • 1. CNPC Xinjiang Oilfield Development Company, Karamay, Xinjiang 834000;

  • 2. NO. 2 Oil Production Plant, PetroChina, Xinjiang Oilfield Company, Karamay, Xinjiang 834000;

  • 3. Baoshihua Xinsheng, PetroChina Southwest Oil & Gasfield Company, Chengdu, Sichuan 610051;

  • 4. State Key Laboratory of Oil & Gas Reservoir Geology and Exploration, Southwest Petroleum University, Chengdu, Sichuan 610500

  • Received Date: 2019-08-14
  • Publish Date: 2019-12-30
    Abstract
  • Simulation of downhole conditions in thermally producing heavy oils is of great importance to the determination of weather the set cement is able to satisfy the needs of thermal production. In the past, set cement was cured in a dry muffle oven with ultra-high temperatures, and this curing environment is not conforming to the conditions encountered downhole a heavy oil thermal production well, such as ultra-high temperature with vapor, and the set cement is constrained by casing string and formation. A new apparatus and a new method have been developed to make the conditions of laboratory experiment more similar or equivalent to the conditions prevailing downhole. With this new apparatus and the new method, the effects of the sample size and rate of heating on the compressive strength and integrity of set cement were studied at ultra-high temperatures with and without vapors. It was found that set cement of small size, low rate of heating and vapor are favorable to the uniform heating of the sample, and this in turn is favorable to the prevention of set cement fracturing by uneven heating and the maintenance of higher compressive strength and integrity of the set cement. It is thus suggested that, based on the study as said above, laboratory simulation should consider the effects of experiment conditions on the simulation results. It is also suggested that the process and parameters of vapor injection be optimized to reduce the rate of heating of set cement by the injection of vapor and to minimize the adverse effects of vapor injection on the set cement.

     

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